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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7
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8 #include <sys/syscall.h>
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9 #include <machine/asm.h>
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10
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11 /*
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12 * rfork_thread(3) - rfork_thread(flags, stack, func, arg);
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13 */
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14
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15 #define KERNCALL int $0x80
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16
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17 ENTRY(rfork_thread)
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18 push %ebp
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19 mov %esp, %ebp
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20 push %esi
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21
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22 mov 12(%ebp), %esi # the stack address
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23
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24 sub $4, %esi
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25 mov 20(%ebp), %eax # the thread argument
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26 mov %eax, (%esi)
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27
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28 sub $4, %esi
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29 mov 16(%ebp), %eax # the start thread address
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30 mov %eax, (%esi)
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31
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32 push 8(%ebp) # rfork(2) flags
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33 push $0
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34 mov $SYS_rfork, %eax
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35 KERNCALL
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36 jc error
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37
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38 cmp $0, %edx
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39 jne child
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40
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41 parent:
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42 add $8, %esp
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43 pop %esi
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44 mov %ebp, %esp
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45 pop %ebp
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46 ret
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47
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48 child:
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49 mov %esi, %esp
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50 pop %eax
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51 call *%eax # call a thread start address ...
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52 add $4, %esp
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53
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54 push %eax
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55 push $0
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56 mov $SYS_exit, %eax # ... and exit(2) after a thread would return
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57 KERNCALL
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58
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59 error:
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60 add $8, %esp
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61 pop %esi
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62 mov %ebp, %esp
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63 pop %ebp
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64 PIC_PROLOGUE
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65
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66 /* libc's cerror: jmp PIC_PLT(HIDENAME(cerror)) */
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67
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68 push %eax
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69 call PIC_PLT(CNAME(__error))
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70 pop %ecx
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71 PIC_EPILOGUE
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72 mov %ecx, (%eax)
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73 mov $-1, %eax
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74 mov $-1, %edx
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75 ret
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